import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.Collections;
import java.util.HashMap;
import java.util.StringTokenizer;
import java.util.TreeSet;
class Main {
public static void main (String [] args) throws Exception {
BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
String s;
while (!(s=br.readLine()).equals("0")){
int n=Integer.parseInt(s);
HashMap<String,Integer> map=new HashMap<>();
for (int i=0;i<n;i++) {
StringTokenizer st=new StringTokenizer(br.readLine());
TreeSet<String> set=new TreeSet<>();
for (int i2=0;i2<5;i2++) set.add(st.nextToken());
String key=set.toString();
map.put(key, map.getOrDefault(key,0)+1);
}
int max=Collections.max(map.values());
System.out.println(map.values().stream().filter(i -> i == max).count()*max);
}
}
}
